246. The insoluble residues in good cement should be
a ) between 4 and 8 %
b ) less than 8 %
c ) between 8 and 10 %
d ) less than 1.5 %
247. During the test of portland cement for ” loss of ignition,” the loss in weight occurs due to
a ) chemical reactions
b ) burning of ingredients
c ) evaporation of moisture and CO₂
d ) melting of tricalcium aluminate
248. The volume of one bag of cement weighing 50 kg is
a ) 0.05m³
b ) 0.0347m²
c ) 0.025m³
d ) 0.04m³
249. Slag cement contains
a ) lime
b ) pozzolona
c ) sulphate
d ) silvicrete
250. If P is the percentage of water required for normal consistency , water to be added for determination of initial setting time is ,
a ) 0.70P
b ) 0.75P
c ) 0.80P
d ) 0.85P
251. A badly mixed cement concrete results in
a ) segregation
b ) bleeding
c ) honey combing
d ) none of the above
252. Strength of cement , with storage
a ) increases
b ) decreases
c ) same
d ) difficult to tell
253. Storage of cement should be done on
a ) brick soling
b ) the ground
c ) wet platform
d ) dry platform
254. The cement mortar mix generally used for masonry work
a ) 1 : 3
b ) 1 : 4
c ) 1 : 5
d ) 1 : 6
255. The cement mortar mix generally used for internal plaster
a ) 1 : 3
b ) 1 : 4
c ) 1 : 5
d ) 1 : 6
256. The cement mortar mix generally used for external plaster
a ) 1 : 3
b ) 1 : 4
c ) 1 : 5
d ) 1 : 6
257. The cement mortar mix generally used for ceiling plaster
a ) 1 : 3
b ) 1 : 4
c ) 1 : 5
d ) 1 : 6
258. During Rana Cracy , types of mortar generally used for public buildings are
a ) cement mortar
b ) mud mortar
c ) dry mortar
d ) lime and surkhi mortar
259. The property of steel enabling it to be drawn into thin wires is called
a ) toughness
b ) hardness
c ) ductility
d ) malleability
260. The Property of metals because of which they can be transformed into different shapes by heating is called
a ) toughness
b ) hardness
c ) ductility
d ) malleability
261. The property due to which steel can withstand hammer blows is called
a ) toughness
b ) hardness
c ) ductility
d ) malleability
262. The operation of removal of impurities or clay adhering to iron ores is known as
a ) dressing
b ) calcinations
c ) roasting
d ) smelting
263. Pig iron made from haematitite are free from sulphur , phosphurus and copper is known as
a ) bessemer pig
b ) foundry pig
c ) forge pig
d ) melted pig
264. The pig iron obtained from provided with fuel at very high
a ) bessemer pig the furnace that is property temperature is called
b ) foundry pig
c ) forge pig
d ) melted pig
265. The pig iron obtained from the furnace that is property provided with insufficient fuel at very low temperature is called
a ) bessemer pig
b ) foundry pig
c ) forge pig
d ) melted pig
266. The process involved in the manufacture of wrought iron from pig iron is known as
a ) refining
b ) pudding
c ) rolling
d ) all of the above
267. For melting one tonne of cast iron the requirement of material is
a ) 700 m³ of air
b ) 20 kg of lime stone
c ) 100 kg of coke
d ) all of the above
268. Pig iron contains carbon up to
a ) 2 %
b ) 3 %
c ) 4 %
d ) 5 %
269. The property of steel is influenced maximum by
a ) iron
b ) manganese
c ) carbon
d ) sulphur
270. Purest form of iron is
a ) mild steel
b ) cast iron
c ) high carbon steel
d ) wrought iron iron has
271. As compared to mild steel , cast
a ) high compressive strength
b ) low tensile strength
c ) both ( a ) & ( b ) of above
d ) none of the above
272. Wrought iron contains carbon up to
a ) 0.10 %
b ) 0.15 %
c ) 0.20 %
d ) 0.25 %
